The invention discloses a layout map of a sense amplifier, which comprises an equalizer and a pre-charger region, and an equalizer transistor, a pre-charger transistor and a gate line are arranged inthe equalizer and the pre-charger region. The gate line and the pre-charger transistor share a common plug as a gate plug of the gate line and a source/drain plug of the pre-charger transistor, respectively.